White knight noun phrase
One who helps someone escape safely from a difficult or dangerous situation such as death, harm, loss, etc.
If it hadn't been for your fighting off the rapists, they would have ruined my life. You are my white knight.
He has become her white knight since he saved her son from being hit by the truck.
A person or a business organisation that saves another organisation struggling financially or about to face hostile takeover bid by putting money in or buying it.
Let's hope a white knight comes and saves us from ínolvency.
Luckily, a white knight has poured millions into our business when our company is forced to file for bankruptcy.
This noun phrase was first record in 1890-95.
One needs to understand the basic techniques or primary details of something before taking actions that require greater skills
Peter failed because he did not learn to walk before he ran.